optional
Americanadjective
-
left to one's choice; not required or mandatory.
Formal dress is optional.
- Synonyms:
- voluntary, elective, discretional
-
leaving something to choice.
adjective
Other Word Forms
Etymology
Origin of optional
Explanation
If you can choose whether or not to do something, it is optional. Extra credit is always optional; death and taxes are not. When you buy a new car, you can decide which options or choices, you would like. Things like a DVD player mounted in the ceiling are optional, you don't need them for the car to work, and it's up to you if you want to pay more for them. The opposite of optional is mandatory. If you're in high school, going to bed at 8:00 is optional, for your little sister in elementary school, it's mandatory.
Vocabulary lists containing optional
Jim Burke's Academic Vocabulary List
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
100 SAT words Beginning with "O"
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
New Kid
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
What follows is a sometimes frustrating, often hilarious hodgepodge of observations about the innate folly of living in a world where treating employees with basic respect is seen as optional.
From Salon • May 22, 2026
Ian Hulme, from the ICO, said: "Waiting for performance issues or a ransom note to discover a breach is not acceptable. Proactive security is a legal requirement, not an optional extra."
From BBC • May 12, 2026
Free community event with optional VIP packages available for purchase.
From Los Angeles Times • May 5, 2026
But scientists, universities, publishers, and funders need to treat peer review as the essential work that it is, not as an optional favor.
From Slate • May 3, 2026
“But don’t say anything to my mom, OK? It’s not a big deal that I skipped an optional practice, but she’ll make it one.”
From "Keeping Pace" by Laurie Morrison
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
